Gartner Research

Stretching Your Data Center Network Could Break Applications and Waste Money

Published: 13 April 2015

ID: G00272966

Analyst(s): Neil Rickard , Andrew Lerner , John Morency


Many network architects are considering "stretched VLANs" to satisfy data center interconnectivity requirements. While these approaches may appear as a simple fix, they often increase complexity, reduce performance and availability, and increase the overall cost of your network.

Table Of Contents
  • Key Challenges


  • Stretching VLANs


  • Don't Assume Stretched VLANs Are Required to Support VM Migrations or Active/Active Data Centers
    • Myth No. 1: Stretched VLANs Are Required for VM Migration
    • Myth No. 2: Stretched VLANs Are Required for Active/Active Data Centers
    • Simplifying IP and DNS Changes Associated With Workload Migration
  • Document the Risks Associated With VLAN Stretching in Order to Make an Appropriate Business Decision Regarding Whether to Implement
    • Technological Challenges
    • Vendor Lock-In
  • Use VLAN Stretching for Specific Usage Scenarios, but Avoid Underpinning a Business Continuity Strategy on It

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